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15) (5 pts) Most people have seen either an actual hot air balloon or a picture...

15) (5 pts) Most people have seen either an actual hot air balloon or a picture of a hot air balloon. A burner at the base of the balloon is used to heat up the air in the balloon, making it expand and become less dense than the air outside the balloon. Thus the balloon floats. What is the pressure inside the balloon? Is it the same as, greater than, or less than the pressure outside the balloon, and how do you know?

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